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  • Resultat 1-10 av 7029
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  • Aaboen, Lise, 1978, et al. (författare)
  • Start-ups repositioning in business networks
  • 2016
  • Ingår i: Entrepreneurial Process and Social Networks: A Dynamic Perspective. - 9781785364884 ; , s. 113-126
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)
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  • Aarrevaara, Timo, et al. (författare)
  • Introduction
  • 2014
  • Ingår i: Higher Education and Research in Academe. - Luleå : Luleå tekniska universitet. - 9789174399745 - 9789174399752 ; , s. 11-17
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)
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  • Abali, Bilen Emek (författare)
  • An Introduction to Piezoelectric and Thermoelectric Materials
  • 2022
  • Ingår i: Handbook of Energy Materials. - Singapore : Springer. - 9789811644801 ; , s. 1-18
  • Bokkapitel (refereegranskat)abstract
    • Materials may demonstrate electromagnetism and thermomechanics coupling. Although we benefit from this coupling in our modern lives, comprehending this coupling is challenging. We intuitively understand that temperature increase causes an expansion in polymers and alloys. Typical example is a plastic water bottle left in the sun, the expansion is visible by naked eyes. Yet it is more abstract to consider that an electric field may create a deformation or even a temperature change. Electromagnetic fields are more abstract since our senses fail to be sensitive to these physical quantities. There are indeed materials with so-called piezoelectric and pyroelectric properties and we use them for sensors and actuators. More confusingly, there is a thermoelectric effect relating electric current and heat flux. In order to set the ideas correctly, we explain these phenomena and introduce to the abstract world of electromagnetism and thermomechanics coupling. Furthermore, we provide an inside look to realize how different types of thermal and electric coupling phenomena work and how to model such materials adequately.
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  • Abbasalizadeh, A., et al. (författare)
  • Rare Earth Extraction from NdFeB Magnets and Rare Earth Oxides Using Aluminum Chloride/Fluoride Molten Salts
  • 2015
  • Ingår i: Rare Earths Industry. - : Elsevier. - 9780128023280 ; , s. 357-373
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
    • In the current research, the feasibility of the recovery of neodymium and dysprosium from spent NdFeB magnets (about 6wt% Dy) was investigated using molten salt processes. The salt bath consisted of a eutectic composition of an NaCl-KCl-LiCl mixture. To enable the efficient dissolution of metal in the molten salt phase, AlCl3 was used as a chlorinating agent. Iron-free electrodeposition was carried out successfully. Energy-dispersive spectroscopic analysis of the electrodeposit revealed that co-deposition of the dysprosium occurs along with neodymium at the cathode. The process shows that this method is well suited for recovering rare earth metals from magnetic scrap containing these metals.Furthermore, the setup design for recovery of neodymium and dysprosium from their oxides was investigated with regard to previous studies on the neodymium magnets. The stability of different fluoride and chloride salts was studied by means of thermodynamic calculation. Aluminum fluoride-based molten salt systems were studied in detail as the electrolyte for electrochemical extraction of rare earth oxides into rare earth metal elements with Al.
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  • Abenoza, Roberto F., et al. (författare)
  • User experiences and perceptions of women-only transport services in Mexico
  • 2020
  • Ingår i: Gendering Smart Mobilities. - : Taylor and Francis. ; , s. 188-209
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
    • Personal safety perceptions impact upon not only travellers’ behaviour and satisfaction but may also diminish their general well-being and health. These effects are particularly negative among female travellers, a group which feels especially vulnerable from certain types of aggression. To tackle women’s personal safety problems several cities around the world introduced transport for women only. Data from Mexico City and its metropolitan area is used to examine how the characteristics of female travellers and of their trips impact upon travel satisfaction with public transport for women only for different travel modes (metro, city bus, and metropolitan BRT) and users based on their previous victimisation. This chapter demonstrates that female travellers’ appreciation of public transport for women only services varies as a function of some of their socio-demographic and travel characteristics (some age groups, trip purposes, and travel frequency). Considering the strength of the marginal effect’s coefficient from a number of ordered logit models three travel attributes should be prioritised: (1) level of satisfaction with travelling with women only, (2) reducing exposure to verbal aggressions, (3) and meeting travellers’ waiting time expectations. This study may help stakeholders identify, target, and prioritise female travellers’ groups which are least satisfied with the service. In addition, this chapter provides some policy recommendations and highlights the role of infrastructure that may help improve the overall travel experience. 
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